US1412937A - Manufacture of thymol - Google Patents
Manufacture of thymol Download PDFInfo
- Publication number
- US1412937A US1412937A US493713A US49371321A US1412937A US 1412937 A US1412937 A US 1412937A US 493713 A US493713 A US 493713A US 49371321 A US49371321 A US 49371321A US 1412937 A US1412937 A US 1412937A
- Authority
- US
- United States
- Prior art keywords
- thymol
- manufacture
- sulfuric acid
- cresol
- germany
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
Definitions
- the invention relates to a process for the synthetic manufacture of thymol (l-methyl- 4-isopropy1-3-hydroxybenzene) which is very simple and which can also be carried out on a commercial scale.
- This process consists in sulfonating meta-cresol, treating the meta-cresol-sulfonic acid so obtained with isopropyl-alcohol and sulfuric acid, preferably effected at a raised temperature and with the sulfuric acid concentrated and finally splitting oil the sulfonic group in the usual, or any suitable manner.
- the thymol which is obtained by distillation is soluble in caustic soda lye either completely or with the exception of very small traces.
- lhe product is subjected to fractional distillation, preferably in vacuo, and separated thereby from first-runnings consisting of unaltered meta-crcsol and afterrunnings containing a product crystallizing from benzene in spectacularly formed large odorless crystals, melting at 114415 degrees centigrade and very likely representmg a thymol-isomcr, whilst the middle fraction, when cooled and inoculated with a thymolcrystal, soon solidifies to a crystalline mass, which, if necessary, can easily be purified further for example from ligroin by recrystallization.
- T he melting point of the synthetic product obtained according to this invention is -51 degrees centigrade.
- I claim 2- The process of manufacturing thymol synthetically which consists in treatin r sulfonated meta-cresol with isopropyl-a cohol and strong sulfuric acid, then splitting off the sulfonic group.
Description
FRITZ G'llNTHER, 0F LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, ASSIGNQE TU EA'DISGHE ANILIN- 5 SODA-FABRIK, 0F LUDWIGSHAEFENf-ON EHE-JRHINE, GENE-ANY, A CORPORATION OF GERMANY.
TEAN'UFACTURE 0F THYTJIOL.
No Drawing.
T 0 all w 710m it may concern Be it known that l, FRITZ GiiN'rr-rna, citizen of Germany, residing at Ludwigshafen-on-the-Rhine, Germany, have invented new and useful Improvements in the Manufacture of lhymol, (for which 1 have made application in- Germany, No. B. 94,890, IV 112 q., July 3, 1920,) of which the following is a specification.
The invention relates to a process for the synthetic manufacture of thymol (l-methyl- 4-isopropy1-3-hydroxybenzene) which is very simple and which can also be carried out on a commercial scale. This process consists in sulfonating meta-cresol, treating the meta-cresol-sulfonic acid so obtained with isopropyl-alcohol and sulfuric acid, preferably effected at a raised temperature and with the sulfuric acid concentrated and finally splitting oil the sulfonic group in the usual, or any suitable manner. The thymol which is obtained by distillation is soluble in caustic soda lye either completely or with the exception of very small traces.
In order to further explain the nature of my invention, 1 give the following example, but the invention is not limited thereto. The parts are by weight.
Ewa/mple.
875 parts of monohydratic sulfuric acid are gradually introduced into 540 parts of meta-cresol, care being taken that the temperature does not exceed about 100 degrees centigrade. After all of the monohydrate has run in, the mixture is kept at 100 degrees centigrade for two hours, then cooled- Specification of Letters IPatent.
Patented Apr. 18., $322.
Application filed August 19, 1921. Serial No. 193,713.
mixed with 1750 parts of water and distilled with steam at from 120 to 130 degrees centigrade, whereby the sulfonic group is split otf and thymol distilled over with the water vapor. The oil obtained is worked up in the usual manner and can be separated from small traces of isopropyl-ether compounds, for example bymeans of caustic alkali. lhe product is subjected to fractional distillation, preferably in vacuo, and separated thereby from first-runnings consisting of unaltered meta-crcsol and afterrunnings containing a product crystallizing from benzene in splendidly formed large odorless crystals, melting at 114415 degrees centigrade and very likely representmg a thymol-isomcr, whilst the middle fraction, when cooled and inoculated with a thymolcrystal, soon solidifies to a crystalline mass, which, if necessary, can easily be purified further for example from ligroin by recrystallization.
T he melting point of the synthetic product obtained according to this invention is -51 degrees centigrade.
I claim 2- 1. The process of manufacturing thymol synthetically which consists in treatin r sulfonated meta-cresol with isopropyl-a cohol and strong sulfuric acid, then splitting off the sulfonic group.
2. The process of manufacturing thymol synthetically which consists in treatin sulfonated mcta-cresol with isopropyl-all-ohol and strong sulfuric acid, then splitting off the sulfonic group by heating with sulfuric acid ,and water.
my hand.
FRITZ GUNTHER.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US493713A US1412937A (en) | 1921-08-19 | 1921-08-19 | Manufacture of thymol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US493713A US1412937A (en) | 1921-08-19 | 1921-08-19 | Manufacture of thymol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1412937A true US1412937A (en) | 1922-04-18 |
Family
ID=23961393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US493713A Expired - Lifetime US1412937A (en) | 1921-08-19 | 1921-08-19 | Manufacture of thymol |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1412937A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2468670A (en) * | 1944-01-25 | 1949-04-26 | Howards & Sons Ltd | Manufacture of thymol |
-
1921
- 1921-08-19 US US493713A patent/US1412937A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2468670A (en) * | 1944-01-25 | 1949-04-26 | Howards & Sons Ltd | Manufacture of thymol |
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